CAMDEN, Maine — A free six-week series featuring documentary film screenings and dynamic conversation, led by musician Glenn Jenks, exploring 20th century American popular music will be held at 3 p.m. Sunday, Jan. 13, at Camden Public Library. This is a project by the Tribeca Film Institute in collaboration with the American Library Association, Tribeca Flashpoint, Society for American Music, National Endowment for the Humanities, and the Maine Humanities Council.